Mott localization in the correlated superconductor Cs3C60 resulting from the molecular Jahn-Teller effect
Abstract
Cs3C60 is a correlated superconductor under pressure, but an insulator under ambient conditions. The mechanism causing this insulating behavior is the combination of Mott localization and the dynamic Jahn-Teller effect. We show evidence from infrared spectroscopy for the dynamic Jahn-Teller distortion. The continuous change with temperature of the splitting of infrared lines is typical Jahn-Teller behavior, reflecting the change in population of solid-state conformers. We conclude that the electronic and magnetic solid-state properties of the insulating state are controlled by molecular phenomena. We estimate the time scale of the dynamic Jahn-Teller effect to be above 10^(-11) s and the energy difference between the conformers less than 20 cm-1.
Keywords
Cite
@article{arxiv.1303.1968,
title = {Mott localization in the correlated superconductor Cs3C60 resulting from the molecular Jahn-Teller effect},
author = {Katalin Kamaras and Gyongyi Klupp and Peter Matus and Alexey Y. Ganin and Alec McLennan and Matthew J. Rosseinsky and Yasuhiro Takabayashi and Martin T. McDonald and Kosmas Prassides},
journal= {arXiv preprint arXiv:1303.1968},
year = {2014}
}
Comments
6 pages, 4 figures, 1 supplementary movie; XXI International Symposium on the Jahn-Teller Effect, Tsukuba, Japan, August 26-31, 2012